In an experiment, 3.264 g of zinc chloride, zncl2, yielded 1.468 g of zinc metal. assuming that the original sample was pure, how much zinc should be obtained? was all zinc possible from the sample recovered? what is the calculated percentage recovery? (answer much contain proper number of significant figures).

The percentage recovery is 93.95%

Zinc Chloride (ZnCl₂) decomposes to yield Zinc metal and chlorine gas.

The equation for the reaction is:

ZnCl₂ → Zn(s) + Cl₂(g)

From the reaction:

1 mole of ZnCl₂ decomposes to yield 1 mole of Zn

We are required to calculate the percentage recovery  of Zn:

First we calculate the Number of moles of ZnCl₂

Number of moles = Mass ÷ Molar mass

                             = 3.264 g ÷ 136.286 g/mol

                             = 0.0239 Moles

Second, we calculate the mole of Zn that would have been obtained if the sample was pure..

From the equation:

But, from the equation 1 mole of ZnCl₂ decomposes to yield 1 mole of Zn

Therefore, the mole ratio is 1 : 1

Hence, moles of Zn = 0.0239 moles

Thirdly, the mass of Zinc that would have been obtained if the sample was pure

Moles of Zn = 0.0239 moles

But; Mass = Moles × Molar mass

Molar mass of Zn = 65.38 g/mol

Therefore;

Mass of Zn = 0.0239 moles × 65.38 g/mol

                  = 1.5626 g

Fourth, we calculate the percentage recovery

Percentage recovery is given by dividing the amount of sample collected by the amount of sample that was supposed to be collected and expressing it as a percentage.

Therefore;

Amount of Zn obtained = 1.468 g

Amount of Zn that was supposed to be obtained = 1.5626 g

% recovery = (1.468 g÷ 1.5626 g)100%

                  =93.95%

Therefore, the percentage recovery is 93.95%

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.